Iftikhar Aziz / mbed-dev

4545

Dependents:   LSS_Rev_1

Fork of mbed-dev by Umar Naeem

drivers/FileBase.cpp@166:33361e55dd8c, 2017-08-23 (annotated)

Committer:
iftaziz
Date:
Wed Aug 23 10:32:38 2017 +0000
Revision:
166:33361e55dd8c
Parent:
160:d5399cc887bb 
r1

Who changed what in which revision?

UserRevisionLine numberNew contents of line
<> 149:156823d33999 1 /* mbed Microcontroller Library
<> 149:156823d33999 2 * Copyright (c) 2006-2013 ARM Limited
<> 149:156823d33999 3 *
<> 149:156823d33999 4 * Licensed under the Apache License, Version 2.0 (the "License");
<> 149:156823d33999 5 * you may not use this file except in compliance with the License.
<> 149:156823d33999 6 * You may obtain a copy of the License at
<> 149:156823d33999 7 *
<> 149:156823d33999 8 * http://www.apache.org/licenses/LICENSE-2.0
<> 149:156823d33999 9 *
<> 149:156823d33999 10 * Unless required by applicable law or agreed to in writing, software
<> 149:156823d33999 11 * distributed under the License is distributed on an "AS IS" BASIS,
<> 149:156823d33999 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
<> 149:156823d33999 13 * See the License for the specific language governing permissions and
<> 149:156823d33999 14 * limitations under the License.
<> 149:156823d33999 15 */
<> 149:156823d33999 16 #include "drivers/FileBase.h"
<> 160:d5399cc887bb 17 #include "drivers/FileLike.h"
<> 149:156823d33999 18
<> 149:156823d33999 19 namespace mbed {
<> 149:156823d33999 20
<> 149:156823d33999 21 FileBase *FileBase::_head = NULL;
<> 149:156823d33999 22 SingletonPtr<PlatformMutex> FileBase::_mutex;
<> 149:156823d33999 23
<> 149:156823d33999 24 FileBase::FileBase(const char *name, PathType t) : _next(NULL),
<> 149:156823d33999 25 _name(name),
<> 149:156823d33999 26 _path_type(t) {
<> 149:156823d33999 27 _mutex->lock();
<> 149:156823d33999 28 if (name != NULL) {
<> 149:156823d33999 29 // put this object at head of the list
<> 149:156823d33999 30 _next = _head;
<> 149:156823d33999 31 _head = this;
<> 149:156823d33999 32 } else {
<> 149:156823d33999 33 _next = NULL;
<> 149:156823d33999 34 }
<> 149:156823d33999 35 _mutex->unlock();
<> 149:156823d33999 36 }
<> 149:156823d33999 37
<> 149:156823d33999 38 FileBase::~FileBase() {
<> 149:156823d33999 39 _mutex->lock();
<> 149:156823d33999 40 if (_name != NULL) {
<> 149:156823d33999 41 // remove this object from the list
<> 149:156823d33999 42 if (_head == this) { // first in the list, so just drop me
<> 149:156823d33999 43 _head = _next;
<> 149:156823d33999 44 } else { // find the object before me, then drop me
<> 149:156823d33999 45 FileBase *p = _head;
<> 149:156823d33999 46 while (p->_next != this) {
<> 149:156823d33999 47 p = p->_next;
<> 149:156823d33999 48 }
<> 149:156823d33999 49 p->_next = _next;
<> 149:156823d33999 50 }
<> 149:156823d33999 51 }
<> 149:156823d33999 52 _mutex->unlock();
<> 160:d5399cc887bb 53
<> 160:d5399cc887bb 54 if (getPathType() == FilePathType) {
<> 160:d5399cc887bb 55 extern void remove_filehandle(FileLike *file);
<> 160:d5399cc887bb 56 remove_filehandle(static_cast<FileLike*>(this));
<> 160:d5399cc887bb 57 }
<> 149:156823d33999 58 }
<> 149:156823d33999 59
<> 149:156823d33999 60 FileBase *FileBase::lookup(const char *name, unsigned int len) {
<> 149:156823d33999 61 _mutex->lock();
<> 149:156823d33999 62 FileBase *p = _head;
<> 149:156823d33999 63 while (p != NULL) {
<> 149:156823d33999 64 /* Check that p->_name matches name and is the correct length */
<> 149:156823d33999 65 if (p->_name != NULL && std::strncmp(p->_name, name, len) == 0 && std::strlen(p->_name) == len) {
<> 149:156823d33999 66 _mutex->unlock();
<> 149:156823d33999 67 return p;
<> 149:156823d33999 68 }
<> 149:156823d33999 69 p = p->_next;
<> 149:156823d33999 70 }
<> 149:156823d33999 71 _mutex->unlock();
<> 149:156823d33999 72 return NULL;
<> 149:156823d33999 73 }
<> 149:156823d33999 74
<> 149:156823d33999 75 FileBase *FileBase::get(int n) {
<> 149:156823d33999 76 _mutex->lock();
<> 149:156823d33999 77 FileBase *p = _head;
<> 149:156823d33999 78 int m = 0;
<> 149:156823d33999 79 while (p != NULL) {
<> 149:156823d33999 80 if (m == n) {
<> 149:156823d33999 81 _mutex->unlock();
<> 149:156823d33999 82 return p;
<> 149:156823d33999 83 }
<> 149:156823d33999 84
<> 149:156823d33999 85 m++;
<> 149:156823d33999 86 p = p->_next;
<> 149:156823d33999 87 }
<> 149:156823d33999 88 _mutex->unlock();
<> 149:156823d33999 89 return NULL;
<> 149:156823d33999 90 }
<> 149:156823d33999 91
<> 149:156823d33999 92 const char* FileBase::getName(void) {
<> 149:156823d33999 93 // Constant read so no lock needed
<> 149:156823d33999 94 return _name;
<> 149:156823d33999 95 }
<> 149:156823d33999 96
<> 149:156823d33999 97 PathType FileBase::getPathType(void) {
<> 149:156823d33999 98 // Constant read so no lock needed
<> 149:156823d33999 99 return _path_type;
<> 149:156823d33999 100 }
<> 149:156823d33999 101
<> 149:156823d33999 102 } // namespace mbed
<> 149:156823d33999 103